In the case where you carry out the same survey on two samples, it is possible to compare the results obtained reciprocally, whether it is a comparison of frequencies or averages.
We wish to know if the frequencies /averages of a same question, are equal or statistically different .
In order to facilitate this stage, we put in your disposition a tool online allowing to set :
http://www.sphinxonline.net/sphinx/aide/comparaisonmoyennes.htm
http://www.sphinxonline.net/sphinx/aide/comparaisonfrequences.htm